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This setup is pretty much exactly what i plan on doing with my 4.7 but I want to utilize the stock air filter box. I've got a K&N drop in filter in there now and think that its a pretty good CAI but I want to make it more free flowing to the TB. Think this set up would work with 3.5 inch PVC and 3.5 inch rubber couplers?

I think I used 3" all around. The 3.5" might work if you can get the hose clamp to tighten down enough around the TB for a snug fit.

Wow that looks great! Will the pvc be affected by the heat,or give off any gases that may harm the engine?

Alot of people have been talking about this.....I wouldn't worry about it, I had an intake made of pvc on another vehicle for over 50k miles, never a problem, sold the truck recently to my boss and I put it all back to stock and it runs good still. It doesn't get hot enough to melt the pipe or release gasses. Anyone whose heated/bent pvc with a heat gun knows it takes a long period of time before it starts melting/emmitting gasses, and that's using a 1000 deg + heat gun. It would take several minutes with even that much heat. Under hood temps are only in the 1** deg range.